SW5240501_Stormwater Report_20240604

CRUMPLER
Consulting Services, PLLC
North Carolina Department of Environmental Quality
Division of Energy, Mineral, & Land Resources—Stormwater Program
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
Re: Gaston Concrete-Youngsville, NC
The commercial site is in the town of Youngsville located within Franklin County, North Carolina. The site
entrance is located along Northbrook Drive. The site is currently vacant and wooded with a small portion
that is a meadow. There is an existing drainage ditch on the southern portion of the site that will not be
impacted. There will be no proposed impact to the streams or wetlands as none are present onsite. The
site generally drains to the south.
Stormwater and runoff generally drains towards the south to an existing channel. The proposed
development will be less than 24% BUA at 19.9% so it will meet the low density requirements for
permitting.The BUA will consist of the building and gravel/paved parking areas.
2308 Ridge Road I Raleigh, NC 27612 I p: 919-413-1704 I e:[e-mail]

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Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday May 9,2024
Gaston Concrete Driveway Pipe-10Yr
Invert Elev Dn (ft) = 100.00 Calculations
Pipe Length (ft) = 50.00 Qmin (cfs) = 2.08
Slope (%) = 1.00 Qmax (cfs) = 2.08
Invert Elev Up (ft) = 100.50 Tailwater Elev (ft) = Normal
Rise (in) = 18.0
Shape = Circular Highlighted
Span (in) = 18.0 Qtotal (cfs) = 2.08
No. Barrels = 1 Qpipe (cfs) = 2.08
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 4.81
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 3.60
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 100.44
HGL Up (ft) = 101.04
Embankment Hw Elev (ft) = 101.25
Top Elevation (ft) = 105.00 Hw/D (ft) = 0.50
Top Width (ft) = 40.00 Flow Regime = Inlet Control
Crest Width (ft) = 40.00
Elev I0) <Nmne> Hw Depth(0)
106.00 550
105.00 /.50
/ \
104.00 3.50
103.00 2.50
102.00 1.50
c�lrol
10100 r..c. 0.50
100.00 -0.50
WOO -1.50
0 5 10 15 20 25 30 35 10 15 50 55 50 65 20
C'rculer LIvert HGL Embank
Reath 00

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Thursday May 9,2024
Gaston Concrete Driveway Pipe-25Yr
Invert Elev Dn (ft) = 100.00 Calculations
Pipe Length (ft) = 50.00 Qmin (cfs) = 2.35
Slope (%) = 1.00 Qmax (cfs) = 2.35
Invert Elev Up (ft) = 100.50 Tailwater Elev (ft) = Normal
Rise (in) = 18.0
Shape = Circular Highlighted
Span (in) = 18.0 Qtotal (cfs) = 2.35
No. Barrels = 1 Qpipe (cfs) = 2.35
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 5.00
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 3.73
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 100.47
HGL Up (ft) = 101.08
Embankment Hw Elev (ft) = 101.31
Top Elevation (ft) = 105.00 Hw/D (ft) = 0.54
Top Width (ft) = 40.00 Flow Regime = Inlet Control
Crest Width (ft) = 40.00
Elev ia) Gaston Concrete Driveway Pipe25Yr Hw Depth(a)
106.00 550
105.00 /.50
104.00 3.50
103.00 2.50
102.00 - 1.50
Inlet control
+0+00 0.50
i
+00.00 --0.50
WOO -1.50
0 5 TO 15 20 25 30 35 10 15 50 55 50 65 70
GlralerGulven HGL &Monk
Reach In)

DESIGN OF RIPRAP OUTLET PROTECTION -SINGLE PIPE
Single Pipe Outlet
Project Gaston Concrete Date 9-May-24
Project No. 23037 Designer Josh C.
Pipe and Flow Data
Outlet ID Driveway Pipe
Pipe diameter 18 in.
Pipe slope 1.00%
Outlet flowrate 2.1 cfs
Outlet velocity 4.8 ft/sec
Zone from graph below= 1
Figure 8.06.b.1
25
20 7
4---____________
15 Zone 6
A'
U
O
10 Zone 5
Zone 4
5 • 4.3
Z ume 3
0 Zone 1
0 1 2 3 4 5 6 7 Zqe 2 9 10
Pipe diameter(ft)
NCDOT Class A Riprap-6'L x 4.5'W x 9"Thick
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o) 3 x D(o)
2 Class B 6 22 6 x D(o) 3 x D(o)
3 Class I 13 22 8 x D(o) 3 x D(o)
4 Class I 13 22 8 x D(o) 3 x D(o)
5 Class II 23 27 10 x D(o) 3 x D(o)
6 Class II 23 27 10 x D(o) 3 x D(o)
7 Special study required
1. Calculations based on NY DOT method-Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
Gaston Riprap Energy Dissipators.xls
5/13/2024

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